cy·​a·​thus | \ ˈsīəthəs \

Definition of cyathus

1 or kyathos \ ˈkīəˌthäs \ plural cyathi\ -​ˌthī \ or kyathoi\ -​ˌthȯi \ : a long-handled cup or earthenware ladle used especially in ancient Greece for filling drinking cups with wine
2 plural cyathi [New Latin, from Latin] : any small cup-shaped cavity or organ of a plant especially : cupule sense 1c
3 capitalized [New Latin, from Latin] : a genus of bird's-nest fungi having the fruit body narrowed at the base and flaring at the top — compare nidulariaceae

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for cyathus

Latin & Greek; Latin cyathus, from Greek kyathos; akin to Greek koilos hollow

Keep scrolling for more

Learn More about cyathus

Statistics for cyathus

Cite this Entry

“Cyathus.” Dictionary, Merriam-Webster, Accessed 5 Aug. 2020.

Comments on cyathus

What made you want to look up cyathus? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

July 2020 Words of the Day Quiz

  • papercraft sunset
  • Which is a synonym of mien?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!